What had looked like a trick of the light was the boy's hair turning copper red, and a smattering of freckles appeared across his nose. He frowned and shifted uncomfortably as he continued to urinate, the stream getting harder as he got taller. A bit of hair appeared on his chin, and his uniform changed from Webelos to a Boy Scout. He remained oblivious to the fae who now stood in the middle of his head.
Puck grinned at Parker. [The human is now about 13, and rather well-endowed sexually. Maybe a bit homely now?] As the fae spoke, the boy's teeth enlarged and his nose got wide and turned up. Then his ears got bigger as his forehead dropped lower. Not exactly ugly, though it wouldn't take much more to push the now homely, if interesting, face over the edge.
Parker watched with wide eyes, then turned away with his face flushed when he realized he was staring at the boy's now very large and uncut penis. [Please stop. He hasn't done anything, and I won't say a word. I promise.] The fae flew up as the boy hefted his now oversized sexual parts, but seemed pleased rather than upset. And when he zipped up, the bulge at his crotch was quite obvious. Parker waited until the new teen had left and then said "Please. Don't hurt anyone else."
The purple-haired fairy chuckled. "Oh, the boy who just left is quite happy. As you and your twin brother will be when you reach his age. That homely youth is almost exactly how you and Lucas will look." Parker felt his face pull slightly, and ran over to see his features getting coarser in the mirror. In a 6-year-old it was still cute, but Parker had just seen the older version. He and his twin brother would be moderately ugly when they grew up. But... he looked up at Puck, who laughed. "Yes, you and Lucas will also be just as well endowed, if not even larger. Messy nights ahead, with bedwetting and nocturnal emissions. And once your testicles get going, you won't be able to get them to stop. Ejaculations will be multiple times a day, plus what you wake up to in the morning."
Parker cocked his head and looked at his face, then nodded. "OK. Can I stay like this? I sorta like being a little kid, especially when I know I will be pretty big when I get older."
This didn't go along with Puck's general dislike of humans. He thought a moment, then grinned.